JP2006167659A - Filter media - Google Patents

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JP2006167659A
JP2006167659A JP2004366307A JP2004366307A JP2006167659A JP 2006167659 A JP2006167659 A JP 2006167659A JP 2004366307 A JP2004366307 A JP 2004366307A JP 2004366307 A JP2004366307 A JP 2004366307A JP 2006167659 A JP2006167659 A JP 2006167659A
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fiber
filter medium
fiber diameter
lactic acid
fibers
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JP2006167659A5 (en
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Mitsuo Yoshida
光男 吉田
Kunihiro Tanabe
邦弘 田辺
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Mitsubishi Paper Mills Ltd
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Mitsubishi Paper Mills Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter material, which displays, with good balance, a performance such as uniformity of the filter material, capturing efficiency of solid particles and pressure drop, contains fibrillated Lyocell fiber and is biodegradable. <P>SOLUTION: The filter material has (A) fibrillated Lyocell fiber having fiber diameter of 1 μm or below which is separated from a trunk part due to the addition of shearing force, (B) fibrillated Lyocell fiber wherein a branch part of fiber diameter of 1 μm or below which is generated from the trunk part of the fiber diameter of 2 μm due to the addition of shearing force, and (C) a kind or more of biodegradable fiber of diameter of 1-30 μm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、濾材に関するものであり、さらに詳しくはクリーンルーム用エアフィルター、ビル空調用エアフィルターなどの用途として、フィルター加工性に優れ、今後ますます問題視されつつある不燃ゴミ対策を配慮した濾材に関するものである。   The present invention relates to a filter medium, and more particularly, to a filter medium that is excellent in filter processability and is considered as a problem for non-combustible dust in the future, for applications such as air filters for clean rooms and air filters for building air conditioning. Is.

フィルターの環境負荷で大きな問題となっているのは使用済みのフィルターの廃棄である。ビル空調、産業空調のエアフィルターの廃棄量は年間3000〜4000トンといわれており、これらの使用済みフィルターは産業廃棄物として焼却処理、埋め立て処理されている。フィルターを使用しているユーザーにとって廃棄物の発生とその処理は深刻な問題であり、このためフィルターの環境対策は廃棄量の減少や環境に負荷を与えない処理法の適用に集中している。   A major problem with the environmental load of filters is the disposal of used filters. The amount of air filters for building air conditioning and industrial air conditioning is said to be 3000 to 4000 tons per year. These used filters are incinerated and landfilled as industrial waste. The generation and disposal of waste is a serious problem for users who use filters, and therefore, environmental measures for filters concentrate on the application of treatment methods that reduce the amount of waste and do not place an environmental burden.

この問題を解決するために、使用後の廃棄の問題を考慮して生分解性繊維からなる不織布にて構成されるエアフィルター基材が出願されている。(特許文献1参照)。
しかし、使用する繊維の繊維径が0.5〜100dtexであり、捕集効率は低く、台所用換気扇やレンジ用空気清浄機用に限定され、ビル空調用やクリーンルーム用のフィルターには適さないものであった。
特開2003−126628号公報
In order to solve this problem, an air filter substrate composed of a non-woven fabric made of biodegradable fibers has been filed in consideration of the problem of disposal after use. (See Patent Document 1).
However, the fiber diameter of the fibers used is 0.5 to 100 dtex, the collection efficiency is low, it is limited to kitchen ventilation fans and range air purifiers, and is not suitable for building air conditioning or clean room filters Met.
JP 2003-126628 A

本発明の課題は、ビル空調用やクリーンルーム用に使用可能であり、生分解性を有し、濾材の均一性、固体粒子の捕集効率、圧力損失といった性能をバランス良く発現した、フィブリル化リヨセル繊維を含有してなる濾材を提供することにある。   An object of the present invention is a fibrillated lyocell that can be used for building air conditioning and clean rooms, has biodegradability, and has a well-balanced expression of filter media uniformity, solid particle collection efficiency, and pressure loss. It is providing the filter medium containing a fiber.

本発明者らは、上記課題を解決するために鋭意検討した結果、
(1)(A)剪断力を加えて幹部から離脱して繊維径1μm以下にフィブリル化したリヨセル繊維、及び(C)繊維径1〜30μmの1種以上の生分解性繊維を含有することを特徴とする濾材、
(2)(B)剪断力を加えて、繊維径2μm以上の幹部から、繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維、及び(C)繊維径1〜30μmの1種以上の生分解性繊維を含有することを特徴とする濾材、
(3)(A)剪断力を加えて幹部から離脱して繊維径1μm以下のフィブリル化リヨセル繊維、(B)剪断力を加えて、繊維径2μm以上の幹部から、繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維、(C)繊維径1〜30μmの1種以上の生分解性繊維を含有することを特徴とする濾材、
(4)生分解性繊維の一部または全てが熱融着性バインダー繊維であることを特徴とする上記(1)〜(3)のいずれかに記載の濾材、
(5)(A)および/または(B)の濾材に対する含有量が1〜70質量%、(C)の濾材に対する含有量が30〜99質量%であることを特徴とする上記(1)〜(4)のいずれかに記載の濾材、
を見いだした。
As a result of intensive studies to solve the above problems, the present inventors have
(1) containing (A) a lyocell fiber fibrillated to a fiber diameter of 1 μm or less by applying a shearing force and fibrillated to a fiber diameter of 1 μm or less, and (C) containing one or more biodegradable fibers having a fiber diameter of 1 to 30 μm. Filter media,
(2) (B) A fibrillated lyocell fiber in which branches having a fiber diameter of 1 μm or less are generated from a trunk part having a fiber diameter of 2 μm or more by applying a shearing force, and (C) one or more kinds of raw fibers having a fiber diameter of 1 to 30 μm. A filter medium comprising degradable fibers,
(3) (A) A fibrillated lyocell fiber having a fiber diameter of 1 μm or less that is detached from the trunk by applying a shearing force, and (B) a branch having a fiber diameter of 1 μm or less from the trunk having a fiber diameter of 2 μm or more by applying a shearing force. A filter medium characterized by containing fibrillated lyocell fiber, (C) one or more biodegradable fibers having a fiber diameter of 1 to 30 μm,
(4) Part or all of the biodegradable fiber is a heat-fusible binder fiber, The filter medium according to any one of (1) to (3) above,
(5) The above (1) to (1), wherein the content of the filter medium (A) and / or (B) is 1 to 70 mass%, and the content of the filter medium (C) is 30 to 99 mass%. (4) The filter medium according to any one of
I found.

本発明の濾材は、(A)剪断力を加えて幹部から離脱した繊維径1μm以下のフィブリル化リヨセル繊維、(B)剪断力を加えて、繊維径2μm以上の幹部から繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維の、二つの状態のうち少なくとも1つの状態のリヨセル繊維が存在し、また、(C)により繊維径の大きい生分解性繊維を適当に配合しているため、濾材の均一性、固体粒子の捕捉能、圧力損失といった性能をバランス良く発現でき、ビル空調用やクリーンルームの中性能エアフィルター用として好適である。また、生分解性繊維にて形成されるため、使用後のコンポスト処理や埋めたてにより最終的には炭酸ガスと水まで分解でき、良好に廃棄処理することができる。   The filter medium of the present invention includes (A) a fibrillated lyocell fiber having a fiber diameter of 1 μm or less detached from the trunk by applying a shearing force, and (B) a branch having a fiber diameter of 1 μm or less from a trunk having a fiber diameter of 2 μm or more by applying a shearing force. Since the lyocell fiber in at least one of the two states of the fibrillated lyocell fiber in which the part is generated exists, and the biodegradable fiber having a large fiber diameter is appropriately blended according to (C), the filter medium Performance such as uniformity, solid particle capturing ability, and pressure loss can be expressed in a well-balanced manner, and it is suitable for use in building air-conditioning and medium performance air filters in clean rooms. Further, since it is formed of biodegradable fibers, it can be finally decomposed into carbon dioxide gas and water by composting after use or filling, and can be disposed of satisfactorily.

以下、本発明を詳説する。本発明において、「リヨセル」とは、ISO規格及び日本のJIS規格に定める繊維用語で「セルロース誘導体を経ずに、直接、有機溶剤に溶解させて紡糸して得られるセルロース繊維」とされている。リヨセル繊維の特徴としては、湿潤強度に優れていること、フィブリル化し易いこと、およびセルロース繊維由来の水素結合によりシート化したときの強度が得やすいこと、等が挙げられる。   The present invention is described in detail below. In the present invention, “Lyocell” is a fiber term defined in ISO standards and Japanese JIS standards, and is “cellulose cellulose obtained by spinning in an organic solvent directly without passing through a cellulose derivative”. . Features of the lyocell fiber include excellent wet strength, easy fibrillation, and easy strength when formed into a sheet by hydrogen bonds derived from cellulose fibers.

リヨセル繊維は、通常のパルプ繊維と同様に、ビーター、PFIミル、シングルディスクリファイナー(SDR)、ダブルディスクリファイナー(DDR)、また、顔料等の分散や粉砕に使用するボールミル、ダイノミル等の叩解、分散設備でフィブリル化可能である。リヨセル繊維はセルロース繊維が原料であることから、フィブリル化した後も水素結合による強度向上が望めるという特徴を有している。   Lyocell fiber is beater, dispersion equipment such as beater, PFI mill, single disc refiner (SDR), double disc refiner (DDR), ball mill, dyno mill, etc. used for dispersing and crushing pigment, etc. Can be fibrillated. Since lyocell fiber is a raw material of cellulose fiber, it has a characteristic that strength improvement by hydrogen bonding can be expected even after fibrillation.

リヨセル繊維の特徴を最大限に発揮させ、濾材の均一性、固体粒子の捕捉能、圧力損失等の性能をバランス良く発現させるためには、最適なフィブリル化条件を見出すことが重要である。(A)剪断力を加えて幹部から離脱して繊維径1μm以下のフィブリル化リヨセル繊維、および/または、(B)剪断力を加えて、繊維径2μm以上の幹部から、繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維の2つのフィブリル化状態のリヨセル繊維を含有する必要がある。   It is important to find optimum fibrillation conditions in order to maximize the characteristics of lyocell fibers and to achieve a balanced expression of filter medium uniformity, solid particle trapping ability, pressure loss, and the like. (A) A fibrillated lyocell fiber having a fiber diameter of 1 μm or less released from the trunk by applying a shear force, and / or (B) a branch having a fiber diameter of 1 μm or less from a trunk having a fiber diameter of 2 μm or more by applying a shear force. It is necessary to contain two fibrillated lyocell fibers of the fibrillated lyocell fibers in which the part is generated.

リヨセル繊維は、叩解することでフィブリル化が進行し濾材に適した素材となりうるが、最適な叩解条件の見極めが重要となる。(A)および(B)が適正に存在するフィブリル化状態を確認するためには、フィブリル化した繊維を水等で十分希釈した後に乾燥させて顕微鏡か好ましくは電子顕微鏡で観察することが好ましい。しかし、最適フィブリル化条件が決定した後はその都度観察しなくても良い。   Lyocell fibers can be fibrillated by beating and become a material suitable for filter media, but it is important to determine the optimum beating conditions. In order to confirm the fibrillation state in which (A) and (B) are properly present, it is preferable that the fibrillated fibers are sufficiently diluted with water and dried and then observed with a microscope or preferably an electron microscope. However, it is not necessary to observe each time after the optimum fibrillation conditions are determined.

本発明の濾材において、固体粒子捕捉能、圧力損失をバランス良く発現するためには、(A)幹部から離脱した繊維径1μm以下のフィブリル化繊維は、アスペクト比(繊維長/繊維径)が10〜100000、好ましくは、100〜50000である。また、(B)幹部から枝部が発生したフィブリル化リヨセル繊維において、幹部のアスペクト比は、10〜50000、好ましくは50〜30000である。また、枝部のアスペクト比は、10 〜100000、好ましくは100〜50000である。これらのフィブリル化状態は、上述の顕微鏡観察によって、確認することができる。   In order to express the solid particle capturing ability and pressure loss in a balanced manner in the filter medium of the present invention, (A) the fibrillated fiber with a fiber diameter of 1 μm or less detached from the trunk part has an aspect ratio (fiber length / fiber diameter) of 10. ˜100,000, preferably 100 to 50,000. Moreover, (B) In the fibrillated lyocell fiber in which the branch portion is generated from the trunk portion, the aspect ratio of the trunk portion is 10 to 50000, preferably 50 to 30000. Further, the aspect ratio of the branch portion is 10 to 100,000, preferably 100 to 50,000. These fibrillation states can be confirmed by microscopic observation as described above.

本発明の濾材において、フィブリル化リヨセル繊維は、(A)剪断力を加えて幹部から離脱した繊維径1μm以下のフィブリル化リヨセル繊維、(B)剪断力を加えて、繊維径2μm以上の幹部から繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維がそれぞれ単独、又は二つのフィブリル化状態として存在している。フィブリル化リヨセル繊維が(B)幹部から枝部が発生したフィブリル化リヨセル繊維のみで濾材を形成される場合、湿式抄造中に水中に分散する際に均一に分散されずに、該繊維の幹部がモコモコ状に重なり合う部分が存在したり、全く存在しない部分が生じたりして、結果として通気性は高いが濾材としての捕集効率は低下してしまう事があるが、繊維径1〜30μmの1種以上の生分解性繊維を併用し均一なネットワークを形成することにより、均一性を高め捕集効率を高めることが出来る。逆に、(A)リヨセル繊維の幹から離脱したフィブリル化繊維のみで濾材を形成される場合、リヨセル繊維が脱落したり、水素結合で結合したフィブリル化リヨセル繊維が空隙を埋めてしまったりして、圧力損失を高めてしまうという問題が生じるが、繊維径1〜30μmの1種以上の有機繊維を併用することによりリヨセル繊維と均一なネットワークを形成し、抄紙ワイヤーからの脱落を防止するばかりでなく、空隙を形成することにより圧力損失を低く抑えることが可能となる。   In the filter medium of the present invention, the fibrillated lyocell fiber is (A) a fibrillated lyocell fiber having a fiber diameter of 1 μm or less released from the trunk by applying a shearing force, and (B) a trunk having a fiber diameter of 2 μm or more by applying a shearing force. The fibrillated lyocell fibers in which branch portions having a fiber diameter of 1 μm or less are generated exist individually or in two fibrillated states. When the fibrillated lyocell fiber is formed of the fibrillated lyocell fiber only with the fibrillated lyocell fiber (B) having branches from the trunk, the fiber trunk is not dispersed uniformly when dispersed in water during wet papermaking. There may be overlapping portions in the form of a mokomoko or a portion that does not exist at all. As a result, although the air permeability is high, the collection efficiency as a filter medium may be reduced, but the fiber diameter is 1 to 30 μm. By using a biodegradable fiber of more than one species together to form a uniform network, the uniformity can be increased and the collection efficiency can be increased. Conversely, when (A) the filter medium is formed only with fibrillated fibers that have detached from the trunk of the lyocell fibers, the lyocell fibers may fall off, or the fibrillated lyocell fibers bonded by hydrogen bonding may fill the voids. The problem of increasing the pressure loss occurs, but by using one or more organic fibers having a fiber diameter of 1 to 30 μm in combination, a uniform network is formed with the lyocell fibers, and only the falling off of the papermaking wire is prevented. However, it is possible to keep the pressure loss low by forming the air gap.

本発明の濾材は、さらに(A)剪断力を加えて幹部から離脱した繊維径1μm以下のフィブリル化リヨセル繊維、(B)剪断力を加えて、繊維径2μm以上の幹部から繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維、(C)繊維径1〜30μmの1種以上の生分解性繊維を含有させることで、濾材の均一性、固体粒子の捕捉能、圧力損失をバランス良く発現させた濾材となる。   The filter medium of the present invention further comprises (A) a fibrillated lyocell fiber having a fiber diameter of 1 μm or less detached from the trunk by applying a shearing force, and (B) a fiber diameter of 1 μm or less from a trunk having a fiber diameter of 2 μm or more by applying a shearing force. By incorporating fibrillated lyocell fibers with branches and (C) one or more biodegradable fibers having a fiber diameter of 1 to 30 μm, the uniformity of filter media, the ability to trap solid particles, and pressure loss are well-balanced. It becomes the letting filter material.

本発明の濾材において、リヨセル繊維の配合比率は特に限定しないが、(A)および/または(B)の濾材に対する総含有量が、1〜70質量%、(C)の含有量が3〜97質量%であることが好ましい。(A)および(B)の含有量が1質量%未満では、フィブリル化したリヨセル繊維が濾材に均一に分布できないことから捕集効率を高めることが出来ない。一方、70質量%を超えると捕集効率は十分得られるものの圧力損失、通気抵抗、通液抵抗が高くなりすぎ、濾材の寿命が短くなってしまう。   In the filter medium of the present invention, the mixing ratio of lyocell fiber is not particularly limited, but the total content of the (A) and / or (B) filter medium is 1 to 70% by mass, and the content of (C) is 3 to 97. It is preferable that it is mass%. When the contents of (A) and (B) are less than 1% by mass, the collection efficiency cannot be increased because the fibrillated lyocell fibers cannot be uniformly distributed in the filter medium. On the other hand, if it exceeds 70% by mass, the collection efficiency is sufficiently obtained, but the pressure loss, ventilation resistance, and liquid passage resistance become too high, and the life of the filter medium is shortened.

本発明の濾材において、(C)繊維径が1〜30μmの生分解性繊維とは、脂肪族ポリエステルからなる繊維が好適に使用できる。脂肪族ポリエステルとしては、ポリグリコール酸やポリ乳酸のようなポリ(α−ヒドロキシ酸)、またはこれらを主たる繰り返し単位とする共重合体が挙げられる。また、ポリ(ε−カプロラクトン)、ポリ(β−プロピオラクトン)のようなポリ(ω−ヒドロキシアルカノエート)や、ポリ−3−ヒドロキシプロピオネート、ポリ−3−ヒドロキシブチレート、ポリ−3−ヒドロキシカプロネート、ポリ−3−ヒドロキシヘプタノエート、ポリ−3−ヒドロキシオクタノエートのようなポリ(β−ヒドロキシアルカノエート)や、これらの繰り返し単位とポリ−3−ヒドロキシバリレートまたはポリ−4−ヒドロキシブチレートの繰り返し単位との共重合体などが挙げられる。   In the filter medium of the present invention, as the biodegradable fiber (C) having a fiber diameter of 1 to 30 μm, a fiber made of an aliphatic polyester can be preferably used. Examples of the aliphatic polyester include poly (α-hydroxy acid) such as polyglycolic acid and polylactic acid, and copolymers having these as main repeating units. Further, poly (ω-hydroxyalkanoate) such as poly (ε-caprolactone) and poly (β-propiolactone), poly-3-hydroxypropionate, poly-3-hydroxybutyrate, poly-3 Poly (β-hydroxyalkanoates) such as hydroxycapronate, poly-3-hydroxyheptanoate, poly-3-hydroxyoctanoate, and repeating units thereof with poly-3-hydroxyvalerate or poly And a copolymer with a repeating unit of -4-hydroxybutyrate.

また、グリコールとジカルボン酸の縮重合体からなるポリアルキレンアルカノエートの例として、ポリエチレンオキサレート、ポリエチレンサクシネート、ポリエチレンアジペート、ポリエチレンアゼレート、ポリブチレンオキサレート、ポリブチレンサクシネート、ポリブチレンアジペート、ポリブチレンセバケート、ポリヘキサメチレンセバケート、ポリネオペンチルオキサレートまたはこれらを主繰り返し単位とするポリアルキレンアルカノエート共重合体が挙げられる。   Examples of polyalkylene alkanoates comprising a condensation polymer of glycol and dicarboxylic acid include polyethylene oxalate, polyethylene succinate, polyethylene adipate, polyethylene azelate, polybutylene oxalate, polybutylene succinate, polybutylene adipate, poly Examples include butylene sebacate, polyhexamethylene sebacate, polyneopentyl oxalate, or a polyalkylene alkanoate copolymer having these as main repeating units.

これらの中でもポリ乳酸系重合体は、機械的特性や剛性に優れるだけでなく難燃性をも有するものである。具体的には、45°ミクロバーナ法による区分3程度の難燃性を有するため、リン系難燃剤を使用することなくエアフィルター基材にリン系難燃剤が配合された従来品と同等の難燃性を付与できる。   Among these, the polylactic acid-based polymer has not only excellent mechanical properties and rigidity but also flame retardancy. Specifically, since it has a flame resistance of about Category 3 by the 45 ° micro burner method, it is as difficult as a conventional product in which a phosphorus flame retardant is blended in an air filter base material without using a phosphorus flame retardant. Can impart flammability.

また、ポリ乳酸系重合体は、芳香族ポリエステル繊維にくらべて発熱量が低いため焼却炉を傷める恐れが少なく、また、有害ガスを発生することもないため、埋め立て処理だけでなく焼却処理も好適に行える。さらに、ポリ乳酸系重合体は、他の脂肪族ポリエステルと比較して剛性が高く、使用時の変形量を少なくできるためより好ましい。   In addition, polylactic acid-based polymers have a lower calorific value than aromatic polyester fibers, so there is less risk of damaging the incinerator, and no harmful gas is generated, so incineration treatment is suitable not only for landfill treatment Can be done. Furthermore, a polylactic acid polymer is more preferable because it has higher rigidity than other aliphatic polyesters and can reduce the amount of deformation during use.

ポリ乳酸系重合体としては、ポリ(D−乳酸)、ポリ(L−乳酸)、D−乳酸とL−乳酸との共重合体、D−乳酸とヒドロキシカルボン酸との共重合体、L−乳酸とヒドロキシカルボン酸との共重合体、D−乳酸とL−乳酸とヒドロキシカルボン酸との共重合体とから選ばれるいずれかの重合体、あるいはこれらのブレンド体が挙げられる。ポリ乳酸のホモポリマーであるポリ(L−乳酸)やポリ(D−乳酸)の融点は約180℃であるが、ポリ乳酸系重合体として前記コポリマーを用いる場合には、実用性と融点等を考慮してポリマー成分の共重合量比を決定することが好ましく、L−乳酸とD−乳酸との共重合比が、モル比で、(L−乳酸)/(D−乳酸)=100/0〜90/10、あるいは(L−乳酸)/(D−乳酸)=10/90〜100/0であることが好ましい。   Examples of the polylactic acid-based polymer include poly (D-lactic acid), poly (L-lactic acid), a copolymer of D-lactic acid and L-lactic acid, a copolymer of D-lactic acid and hydroxycarboxylic acid, L- Examples thereof include a copolymer of lactic acid and hydroxycarboxylic acid, any polymer selected from a copolymer of D-lactic acid, L-lactic acid, and hydroxycarboxylic acid, or a blend thereof. Poly (L-lactic acid) and poly (D-lactic acid), which are homopolymers of polylactic acid, have a melting point of about 180 ° C. However, when the copolymer is used as a polylactic acid polymer, practicality and melting point are It is preferable to determine the copolymerization amount ratio of the polymer component in consideration of the copolymerization ratio of L-lactic acid and D-lactic acid in terms of molar ratio (L-lactic acid) / (D-lactic acid) = 100/0. It is preferable that it is -90/10 or (L-lactic acid) / (D-lactic acid) = 10 / 90-100 / 0.

乳酸とヒドロキシカルボン酸との共重合体である場合におけるヒドロキシカルボン酸としては、グリコール酸、ヒドロキシ酪酸、ヒドロキシ吉草酸、ヒドロキシペンタン酸、ヒドロキシカプロン酸、ヒドロキシヘプタン酸、ヒドロキシオクタン酸等が挙げられ、中でも特に、ヒドロキシカプロン酸またはグリコール酸を用いることが生分解性および低コストの点から好ましい。   Examples of the hydroxycarboxylic acid in the case of a copolymer of lactic acid and hydroxycarboxylic acid include glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxypentanoic acid, hydroxycaproic acid, hydroxyheptanoic acid, hydroxyoctanoic acid, and the like. Of these, hydroxycaproic acid or glycolic acid is particularly preferred from the viewpoint of biodegradability and low cost.

また、皮膜の少ない木材パルプ、麻パルプ、コットンリンター、リント、リヨセル繊維、また、再生繊維としては、レーヨン、キュプラ、などの繊維が挙げられる。上記の繊維の他に、植物繊維として、針葉樹パルプ、広葉樹パルプなどの木材パルプや藁パルプ、竹パルプ、ケナフパルプなどの木本類、草本類を含むものとする。これらの繊維はフィブリル化されていても通液性、通気性を阻害しない範囲であればなんら差し支えない。さらに、古紙、損紙などから得られるパルプ繊維等も含まれる。   Further, wood pulp, hemp pulp, cotton linter, lint, lyocell fiber with little film, and regenerated fibers include fibers such as rayon and cupra. In addition to the above-described fibers, the plant fibers include wood pulps such as softwood pulp and hardwood pulp, woods such as straw pulp, bamboo pulp, kenaf pulp, and herbs. Even if these fibers are fibrillated, there is no problem as long as they do not impair liquid permeability and air permeability. Furthermore, pulp fibers obtained from waste paper, waste paper, and the like are also included.

本発明の濾材のように、(A)および/または(B)のフィブリル化リヨセル繊維と、(C)繊維径1〜30μmで1種以上の生分解性繊維を含有したシートは、該リヨセル繊維が繊維径1μm以上の生分解性繊維に程良く絡み合い、良好な三次元ネットワークを形成することにより、緻密さによる捕集性能を保持しつつ、適当な空間によって通気性、通液性を確保することができる。好ましくは、1μm以上の生分解性繊維が繊維径の異なる2種類以上の繊維等を含んだ場合、ネットワークにさらなる空間が生まれ通気性、通液性が向上する。   Like the filter medium of the present invention, a sheet containing (A) and / or (B) fibrillated lyocell fiber and (C) one or more types of biodegradable fibers having a fiber diameter of 1 to 30 μm. Is entangled with biodegradable fibers having a fiber diameter of 1 μm or more, and forms a good three-dimensional network, thereby maintaining air permeability and liquid permeability in an appropriate space while maintaining the collection performance due to denseness. be able to. Preferably, when the biodegradable fiber of 1 μm or more contains two or more kinds of fibers having different fiber diameters, a further space is created in the network and air permeability and liquid permeability are improved.

また、用途上支障がなければ1μm以上の生分解性繊維以外に繊維径0.1〜20μmの無機繊維、好ましくはガラス繊維を併用することにより、更なるネットワークと空間が確保され、通気性、通液性が良好な濾材が得られる。   Further, if there is no problem in use, in addition to the biodegradable fiber of 1 μm or more, by using an inorganic fiber having a fiber diameter of 0.1 to 20 μm, preferably glass fiber, further network and space are secured, and air permeability, A filter medium with good liquid permeability can be obtained.

本発明の濾材において、(C)繊維径が1〜30μmの生分解性繊維の一部または全てが熱融着性バインダー繊維が、熱融着性バインダー繊維であっても良い。熱融着性バインダー繊維を含有させて、該バインダー繊維の溶融温度以上に濾材の温度を上げる工程を濾材の製造工程に組み入れることで、濾材の機械的強度が向上する。例えば、濾材を湿式抄造法で製造し、その後の乾燥工程で、熱融着性バインダー繊維を溶融させることができる。   In the filter medium of the present invention, (C) a part or all of the biodegradable fiber having a fiber diameter of 1 to 30 μm may be a heat-fusible binder fiber or a heat-fusible binder fiber. By incorporating a heat-fusible binder fiber and raising the temperature of the filter medium above the melting temperature of the binder fiber, the mechanical strength of the filter medium is improved. For example, the filter medium can be produced by a wet papermaking method, and the heat-fusible binder fiber can be melted in the subsequent drying step.

本発明の濾材に係わる熱融着性バインダー繊維としては、単繊維のほか、芯鞘繊維(コアシェルタイプ)、並列繊維(サイドバイサイドタイプ)、放射状分割繊維などの複合繊維が挙げられる。複合繊維は、皮膜を形成しにくいので、濾材の空間を保持したまま、機械的強度を向上させることができる。   Examples of the heat-fusible binder fiber relating to the filter medium of the present invention include single fibers, and composite fibers such as core-sheath fibers (core-shell type), parallel fibers (side-by-side type), and radially divided fibers. Since the composite fiber hardly forms a film, the mechanical strength can be improved while maintaining the space of the filter medium.

本発明の濾材において、熱融着性バインダー繊維の成分として使用することができるポリ乳酸系重合体は、乳酸モノマーの光学活性を利用して製造することができる。すなわち、乳酸モノマーは光学活性の炭素を有しており、D−乳酸とL−乳酸の光学異性体が存在することから、D−乳酸とL−乳酸の共重合比を調整することで行える。例えば、L−乳酸にD−乳酸を1モル%共重合させると融点が170℃、D−乳酸を3モル%共重合させると融点が150℃、D−乳酸を7モル%共重合させると融点が130℃、D−乳酸を12モル%共重合させると融点が110℃といった具合に、ポリ乳酸の融点のコントロールが可能である。従って、熱融着性バインダー繊維としてポリ乳酸系重合体からなる繊維を用いる場合には、上記のようにD−乳酸とL−乳酸との共重合比を制御してその融点を調整する。   In the filter medium of the present invention, the polylactic acid polymer that can be used as a component of the heat-fusible binder fiber can be produced by utilizing the optical activity of the lactic acid monomer. That is, since the lactic acid monomer has optically active carbon and there are optical isomers of D-lactic acid and L-lactic acid, it can be achieved by adjusting the copolymerization ratio of D-lactic acid and L-lactic acid. For example, when 1 mol% of D-lactic acid is copolymerized with L-lactic acid, the melting point is 170 ° C., when 3 mol% of D-lactic acid is copolymerized, the melting point is 150 ° C., and 7 mol% of D-lactic acid is copolymerized. Is 130 ° C. and 12 mol% of D-lactic acid is copolymerized, the melting point of the polylactic acid can be controlled such that the melting point is 110 ° C. Therefore, when using a fiber comprising a polylactic acid polymer as the heat-fusible binder fiber, the melting point is adjusted by controlling the copolymerization ratio of D-lactic acid and L-lactic acid as described above.

本発明の濾材の坪量は特に限定しないが、フィルターに加工する際の強度や必要濾材面積を考慮すると、30〜150g/m2が好ましく、より好ましくは、50〜100g/m2である。 Although the basic weight of the filter medium of the present invention is not particularly limited, it is preferably 30 to 150 g / m 2 , more preferably 50 to 100 g / m 2 in consideration of the strength when processing into a filter and the required filter medium area.

本発明の濾材には、必要に応じて濾材の特性を阻害しない範囲で、架橋剤、撥水剤、分散剤、歩留り向上剤、紙力剤、染料などの添加剤を適宜配合することができる。   In the filter medium of the present invention, additives such as a cross-linking agent, a water repellent, a dispersant, a yield improver, a paper strength agent, and a dye can be appropriately blended as needed as long as the characteristics of the filter medium are not impaired. .

本発明の濾材および液体濾過用フィルター濾材は、一般紙や湿式不織布を製造するための抄紙機、例えば、長網抄紙機、円網抄紙機、傾斜ワイヤー式抄紙機が単独、またはこれらの抄紙機が同種または異種の2機以上がオンラインで設置されているコンビネーション抄紙機などにより製造される。抄紙機で製造された湿紙は、ドライヤーで乾燥させる。乾燥させた後、熱可塑性樹脂を含有させ、エアードライヤー、シリンダードライヤー、サクションドラム式ドライヤー、赤外方式ドライヤー等で乾燥する。   The filter medium and the filter medium for liquid filtration of the present invention are paper machines for producing general paper and wet nonwoven fabrics, for example, a long net paper machine, a circular net paper machine, an inclined wire type paper machine, or these paper machines. Is manufactured by a combination paper machine or the like in which two or more same or different machines are installed online. The wet paper produced by the paper machine is dried with a dryer. After drying, a thermoplastic resin is contained and dried with an air dryer, a cylinder dryer, a suction drum dryer, an infrared dryer or the like.

以下、本発明を実施例を挙げて本発明を具体的に説明するが、本発明は本実施例に限定されるものではない。   EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to the examples.

フィブリル化していないリヨセル単繊維(1.7dtex×4mm、コートルズ社製)をダブルディスクリファイナーを用いて40回繰り返し処理し、幹部から離脱した平均繊維径0.9μmのフィブリル化リヨセル繊維を調製した。上記フィブリル化リヨセル繊維を1質量%、生分解性繊維としてポリ乳酸(融点170℃、共重合モル比:D−乳酸/L−乳酸=2/98)からなる繊維径1.1dtex、繊維長が5mmの繊維を49質量%、生分解性熱融着繊維として融点が170℃であるポリ乳酸(共重合モル比:D−乳酸/L−乳酸=2/98)が芯部に、融点が130℃のポリ乳酸(共重合モル比:D−乳酸/L−乳酸=8/92)が鞘部となるように質量比1:1で芯鞘型に複合された繊維径2.2dtex、繊維長が5mmの芯鞘型熱融着短繊維を50質量%の比率で水に分散し、乾燥重量60g/m2になるように分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度140℃のシリンダードライヤーで乾燥して、実施例1の濾材を作製した。 Non-fibrillated lyocell monofilament (1.7 dtex × 4 mm, manufactured by Coatles Co., Ltd.) was repeatedly treated 40 times using a double disc refiner to prepare fibrillated lyocell fibers having an average fiber diameter of 0.9 μm detached from the trunk. The fibrillated lyocell fiber is 1% by mass, the fiber diameter is 1.1 dtex made of polylactic acid (melting point 170 ° C., copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as biodegradable fiber, and the fiber length is Polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) having a melting point of 170 ° C. as 49% by mass of a 5 mm fiber and a biodegradable heat-fusible fiber has a melting point of 130. Fiber diameter 2.2 dtex, fiber length compounded in a core-sheath type at a mass ratio of 1: 1 so that polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 8/92) at 1 ° C. becomes a sheath part 5 mm core-sheath type heat-sealing short fibers are dispersed in water at a ratio of 50% by mass, and the dispersion is collected so as to have a dry weight of 60 g / m 2. Paper is then made using a standard square hand-made paper machine. And dried with a cylinder dryer having a surface temperature of 140 ° C. to produce the filter medium of Example 1. .

フィブリル化していないリヨセル単繊維(1.7dtex×4mm、コートルズ社製)をシングルディスクリファイナーを用いて30回繰り返し処理し、平均繊維径4μmの幹部から平均繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維の混合繊維を調製した。上記フィブリル化リヨセル繊維10質量%、生分解性繊維としてポリ乳酸(融点170℃、共重合モル比:D−乳酸/L−乳酸=2/98)からなる繊維径1.1dtex、繊維長が5mmの繊維を40質量%、生分解性熱融着繊維として融点が170℃であるポリ乳酸(共重合モル比:D−乳酸/L−乳酸=2/98)が芯部に、融点が130℃のポリ乳酸(共重合モル比:D−乳酸/L−乳酸=8/92)が鞘部となるように質量比1:1で芯鞘型に複合された繊維径2.2dtex、繊維長が5mmの芯鞘型熱融着短繊維を50質量%の比率で水に分散し、乾燥重量60g/m2になるように分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度140℃のシリンダードライヤーで乾燥して、実施例2の濾材を作製した。 Non-fibrillated lyocell monofilament (1.7 dtex × 4 mm, manufactured by Coatles Co., Ltd.) was repeatedly treated 30 times using a single disc refiner, and fibrillation was generated from a trunk having an average fiber diameter of 4 μm to a branch having an average fiber diameter of 1 μm or less. A mixed fiber of lyocell fibers was prepared. 10% by mass of the fibrillated lyocell fiber, a fiber diameter of 1.1 dtex made of polylactic acid (melting point 170 ° C., copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as a biodegradable fiber, and a fiber length of 5 mm Polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) having a melting point of 170 ° C. as a biodegradable heat-fusible fiber is 40% by mass, and the melting point is 130 ° C. Of polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 8/92) having a mass ratio of 1: 1 and a fiber diameter of 2.2 dtex and a fiber length of 1: 1 in a sheath ratio. 5 mm core-sheath-type heat-sealed short fibers were dispersed in water at a ratio of 50% by mass, and the dispersion was sampled to a dry weight of 60 g / m 2, and paper was made using a standard square hand-made paper machine. Thereafter, the filter medium of Example 2 was prepared by drying with a cylinder dryer having a surface temperature of 140 ° C. .

フィブリル化していないリヨセル単繊維(1.7dtex×4mm、コートルズ社製)をPFIミルを用いて40000回転処理し、幹部から離脱した繊維径1μm以下のフィブリル化リヨセル繊維と、平均繊維径4μmの幹部から平均繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維の混合繊維を調製した。上記フィブリル化リヨセル繊維20質量%、生分解性繊維としてポリ乳酸(融点170℃、共重合モル比:D−乳酸/L−乳酸=2/98)からなる繊維径1.1dtex、繊維長が5mmの繊維を30質量%、生分解性熱融着繊維として融点が170℃であるポリ乳酸(共重合モル比:D−乳酸/L−乳酸=2/98)が芯部に、融点が130℃のポリ乳酸(共重合モル比:D−乳酸/L−乳酸=8/92)が鞘部となるように質量比1:1で芯鞘型に複合された繊維径2.2dtex、繊維長が5mmの芯鞘型熱融着短繊維を50質量%の比率で水に分散し、乾燥重量60g/m2になるように分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度140℃のシリンダードライヤーで乾燥して、実施例3の濾材を作製した。 Non-fibrillated lyocell monofilament (1.7 dtex × 4 mm, manufactured by Coatles Co., Ltd.) was processed for 40000 rotations using a PFI mill, and fibrillated lyocell fiber having a fiber diameter of 1 μm or less detached from the trunk, and trunk having an average fiber diameter of 4 μm From this, mixed fibers of fibrillated lyocell fibers in which branch portions having an average fiber diameter of 1 μm or less were generated were prepared. 20% by mass of the fibrillated lyocell fiber, a fiber diameter of 1.1 dtex made of polylactic acid (melting point 170 ° C., copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as a biodegradable fiber, and a fiber length of 5 mm Polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) having a melting point of 170 ° C. as a biodegradable heat-fusible fiber is 30% by mass, and the melting point is 130 ° C. Of polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 8/92) having a mass ratio of 1: 1 and a fiber diameter of 2.2 dtex and a fiber length of 1: 1 in a sheath ratio. 5 mm core-sheath-type heat-sealed short fibers were dispersed in water at a ratio of 50% by mass, and the dispersion was sampled to a dry weight of 60 g / m 2, and paper was made using a standard square hand-made paper machine. Thereafter, the filter medium of Example 3 was prepared by drying with a cylinder dryer having a surface temperature of 140 ° C. .

(比較例1)
生分解性繊維としてポリ乳酸(融点170℃、共重合モル比:D−乳酸/L−乳酸=2/98)からなる繊維径1.1dtex、繊維長が5mmの繊維を50質量%、生分解性熱融着繊維として融点が170℃であるポリ乳酸(共重合モル比:D−乳酸/L−乳酸=2/98)が芯部に、融点が130℃のポリ乳酸(共重合モル比:D−乳酸/L−乳酸=8/92)が鞘部となるように質量比1:1で芯鞘型に複合された繊維径2.2dtex、繊維長が5mmの芯鞘型熱融着短繊維を50質量%の比率で水に分散し、乾燥重量60g/m2になるように分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度140℃のシリンダードライヤーで乾燥して、比較例1の濾材を作製した。
(Comparative Example 1)
Biodegradable fiber: Polylactic acid (melting point: 170 ° C., copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) Fiber diameter of 1.1 dtex, fiber length of 5 mm, 50% by mass, biodegradable fiber Polylactic acid having a melting point of 170 ° C. (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as the core heat-bonding fiber and polylactic acid having a melting point of 130 ° C. (copolymerization molar ratio: D-lactic acid / L-lactic acid = 8/92) is a core-sheath type heat-sealed short having a fiber diameter of 2.2 dtex and a fiber length of 5 mm, which is composited in a core-sheath type at a mass ratio of 1: 1 so that a sheath part is formed. Cylinder dryer having a surface temperature of 140 ° C. after dispersing the fiber in water at a ratio of 50% by mass, collecting the dispersion to a dry weight of 60 g / m 2 , making a paper using a standard square hand-made paper machine. And dried to prepare a filter medium of Comparative Example 1.

(比較例2)
フィブリル化していないリヨセル単繊維(1.7dtex×5mm、コートルズ社製)を顔料等の分散装置であるボールミル(ペイントコンディショナー)に直径2mmのビーズを水と共に投入し、11時間処理した。その結果、リヨセル繊維はフィブリル化の過程を超えて、粒子状になっていた。このリヨセル処理品を10質量%、生分解性繊維としてポリ乳酸(融点170℃、共重合モル比:D−乳酸/L−乳酸=2/98)からなる繊維径1.1dtex、繊維長が5mmの繊維を40質量%、生分解性熱融着繊維として融点が170℃であるポリ乳酸(共重合モル比:D−乳酸/L−乳酸=2/98)が芯部に、融点が130℃のポリ乳酸(共重合モル比:D−乳酸/L−乳酸=8/92)が鞘部となるように質量比1:1で芯鞘型に複合された繊維径2.2dtex、繊維長が5mmの芯鞘型熱融着短繊維を50質量%の比率で水に分散し、乾燥重量60g/m2になるように分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度140℃のシリンダードライヤーで乾燥して、比較例2の濾材を作製した。
(Comparative Example 2)
Non-fibrillar lyocell monofilament (1.7 dtex × 5 mm, manufactured by Courtles Co., Ltd.) was charged with 2 mm diameter beads together with water in a ball mill (paint conditioner) which is a dispersing device for pigments, and treated for 11 hours. As a result, the lyocell fiber was in the form of particles beyond the fibrillation process. 10% by mass of the lyocell-treated product, a fiber diameter of 1.1 dtex made of polylactic acid (melting point: 170 ° C., copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as a biodegradable fiber, and a fiber length of 5 mm Polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) having a melting point of 170 ° C. as a biodegradable heat-fusible fiber is 40% by mass, and the melting point is 130 ° C. Of polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 8/92) having a mass ratio of 1: 1 and a fiber diameter of 2.2 dtex and a fiber length of 1: 1 in a sheath ratio. 5 mm core-sheath-type heat-sealing short fibers were dispersed in water at a ratio of 50% by mass, and the dispersion was sampled to a dry weight of 60 g / m 2, and paper was made using a standard square hand-made paper machine. Then, it dried with the cylinder dryer whose surface temperature is 140 degreeC, and produced the filter medium of the comparative example 2. FIG.

(比較例3)
フィブリル化していないリヨセル単繊維(1.7dtex×4mm、コートルズ社製)をダブルディスクリファイナーを用いて40回繰り返し処理し、幹部から離脱した平均繊維径0.9μmのフィブリル化リヨセル繊維を調製した。上記フィブリル化リヨセル繊維を1質量%、生分解性繊維としてポリ乳酸(融点170℃、共重合モル比:D−乳酸/L−乳酸=2/98)からなる繊維径1.1dtex、繊維長が5mmの繊維を49質量%、ユニチカファイバー社製のポリエステルバインダー繊維「メルティ」2.2dtex、繊維長5mmの芯鞘型熱融着短繊維を50質量%の比率で水に分散し、乾燥重量60g/m2になるように分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度140℃のシリンダードライヤーで乾燥して、比較例3の濾材を作製した。
(Comparative Example 3)
Non-fibrillated lyocell monofilament (1.7 dtex × 4 mm, manufactured by Coatles Co., Ltd.) was repeatedly treated 40 times using a double disc refiner to prepare fibrillated lyocell fibers having an average fiber diameter of 0.9 μm detached from the trunk. The fibrillated lyocell fiber is 1% by mass, the fiber diameter is 1.1 dtex made of polylactic acid (melting point 170 ° C., copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as biodegradable fiber, and the fiber length is 49% by weight of 5 mm fiber, polyester binder fiber “Melty” 2.2 dtex manufactured by Unitika Fiber Co., Ltd., and core-sheath type heat-sealing short fiber having a fiber length of 5 mm are dispersed in water at a ratio of 50% by weight, and the dry weight is 60 g. The dispersion liquid was collected so as to be / m 2 , paper was made using a standard square hand-made paper machine, and then dried with a cylinder dryer having a surface temperature of 140 ° C. to prepare a filter medium of Comparative Example 3.

<濾材の評価>
上記実施例1〜3及び比較例1〜3で作製した濾材について、坪量、圧力損失、粒子捕集効率、引張強度、生分解性、プリーツ加工性を以下の方法で評価した(表1)。
<Evaluation of filter media>
About the filter medium produced in the said Examples 1-3 and Comparative Examples 1-3, basic weight, pressure loss, particle collection efficiency, tensile strength, biodegradability, and pleat workability were evaluated by the following methods (Table 1). .

<圧力損失(単位:Pa)>
JIS B9908に準じて、面風速5.3cm/秒の条件で測定した。
<Pressure loss (unit: Pa)>
According to JIS B9908, it measured on the conditions of the surface wind speed of 5.3 cm / sec.

<粒子捕集効率(単位:%)>
JIS B9908に準じて面風速5.3cm/秒の条件で測定した。測定対象粒子は、大気塵を使用して、粒子径0.3〜0.5μmの粒子についての捕集効率をパーティクルカウンター(商品名「KC−11」、リオン社製)を使用して測定した。捕集効率が15%以上であれば、ビル空調用エアフィルターやクリーンルーム用中・高性能エアフィルターに使用可能となる。
<Particle collection efficiency (unit:%)>
The surface wind speed was measured at 5.3 cm / second in accordance with JIS B9908. The particles to be measured were measured using an air dust and the collection efficiency of particles having a particle diameter of 0.3 to 0.5 μm using a particle counter (trade name “KC-11”, manufactured by Rion Co., Ltd.). . If the collection efficiency is 15% or more, it can be used for air filters for building air conditioning and medium / high performance air filters for clean rooms.

<引張強度(単位:kN/m)>
JIS P8113に則り、濾材を幅15mm、長さ200mmに裁断し、テンシロン測定機(オリエンテック社製、HTM−100)を用いて、フルスケール4kgで、破断時の荷重をおのおの10回測定し、その平均値を示した。
<Tensile strength (unit: kN / m)>
In accordance with JIS P8113, the filter medium is cut into a width of 15 mm and a length of 200 mm, and the load at break is measured 10 times each with a full scale of 4 kg using a Tensilon measuring machine (Orientec Co., Ltd., HTM-100). The average value was shown.

<生分解性>
濾材を6ヶ月間土中に埋設し、その後フィルターの形状が維持されているか観察した。そして、6ヶ月経過後に原型をとどめていないものを○、ほぼそのままの形状であったものを×で表した。
<Biodegradability>
The filter medium was embedded in the soil for 6 months, and then it was observed whether the shape of the filter was maintained. In addition, those that did not retain the original shape after 6 months passed were indicated by ◯, and those that were almost as they were were indicated by ×.

<プリーツ(ひだ折り)加工性試験>
サンプルをひだ状に加工し、加工性の良いものを○、悪いものを×で評価した。
<Pleated (folded) processability test>
Samples were processed into pleats, and those with good workability were evaluated as “good” and those with poor work as “poor”.

Figure 2006167659
Figure 2006167659

表1の結果より、リヨセル繊維を最適にフィブリル化した繊維を使用した実施例1〜3の濾材は、圧力損失、捕集効率のバランスが良く、エアフィルターの濾材に適していることが分かる。   From the results in Table 1, it can be seen that the filter media of Examples 1 to 3 using fibers in which lyocell fibers are optimally fibrillated have a good balance of pressure loss and collection efficiency, and are suitable for air filter media.

比較例1の濾材はフィブリル化したリヨセル繊維を使用していないため、捕集効率が極めて低く、ビル空調やクリーンルームの中性能エアフィルターには適さない。
比較例2の濾材は、リヨセル繊維をフィブリル化したものの、その後過剰に叩解を進めているために粒子状になってしまっていた。そのため、抄造時に粒子状のリヨセルが抄紙網から抜け落ち、所定の坪量が得られなかった。また、その濾材は他の繊維と有効にネットワークを形成できないことから捕集効率が低かった。
比較例3は、生分解性ではないポリエステル繊維を使用したため、生分解性が悪かった。
Since the filter medium of Comparative Example 1 does not use fibrillated lyocell fiber, the collection efficiency is extremely low, and it is not suitable for a medium-performance air filter of a building air conditioner or a clean room.
Although the filter medium of Comparative Example 2 was fibrillated from lyocell fiber, it was in the form of particles due to excessive beating thereafter. Therefore, the particulate lyocell fell off from the papermaking net during paper making, and a predetermined basis weight could not be obtained. Moreover, the filter medium had a low collection efficiency because it could not form a network effectively with other fibers.
Since the comparative example 3 used the polyester fiber which is not biodegradable, biodegradability was bad.

本発明の濾材は、エアフィルター等に有効に用いる事が出来る。   The filter medium of the present invention can be effectively used for an air filter or the like.

Claims (5)

(A)剪断力を加えて幹部から離脱して繊維径1μm以下にフィブリル化したリヨセル繊維、及び(C)繊維径1〜30μmの1種以上の生分解性繊維を含有することを特徴とする濾材。   (A) It contains lyocell fiber fibrillated to a fiber diameter of 1 μm or less by applying shearing force and (C) one or more biodegradable fibers having a fiber diameter of 1 to 30 μm. Filter media. (B)剪断力を加えて、繊維径2μm以上の幹部から、繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維、及び(C)繊維径1〜30μmの1種以上の生分解性繊維を含有することを特徴とする濾材。   (B) A fibrillated lyocell fiber in which branches having a fiber diameter of 1 μm or less are generated from a trunk part having a fiber diameter of 2 μm or more by applying a shearing force, and (C) one or more types of biodegradable fibers having a fiber diameter of 1 to 30 μm A filter medium comprising: (A)剪断力を加えて、幹部から離脱した繊維径1μm以下のフィブリル化リヨセル繊維、(B)剪断力を加えて、繊維径2μm以上の幹部から、繊維径1μm以下の枝部が発生したフィブリル化リヨセル繊維、(C)繊維径1〜30μmの1種以上の生分解性繊維を含有することを特徴とする濾材。   (A) A fibrillated lyocell fiber having a fiber diameter of 1 μm or less detached from the trunk by applying a shearing force, and (B) a branch having a fiber diameter of 1 μm or less was generated from the trunk having a fiber diameter of 2 μm or more by applying a shearing force. A filter medium comprising a fibrillated lyocell fiber and (C) one or more biodegradable fibers having a fiber diameter of 1 to 30 μm. 生分解性繊維の一部または全てが熱融着性バインダー繊維であることを特徴とする請求項1〜3のいずれかに記載の濾材。   The filter medium according to any one of claims 1 to 3, wherein a part or all of the biodegradable fiber is a heat-fusible binder fiber. (A)および/または(B)の濾材に対する総含有量が1〜70質量%、(C)の濾材に対する含有量が30〜99質量%であることを特徴とする請求項1〜4のいずれかに記載の濾材。   The total content with respect to the filter medium of (A) and / or (B) is 1 to 70% by mass, and the content with respect to the filter medium of (C) is 30 to 99% by mass. The filter medium according to Crab.
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2023037440A1 (en) * 2021-09-08 2023-03-16 北越コーポレーション株式会社 Filter material for air filters
WO2024122160A1 (en) * 2022-12-05 2024-06-13 北越コーポレーション株式会社 Filter material for air filter, and method for manufacturing same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003126628A (en) * 2001-10-26 2003-05-07 Unitica Fibers Ltd Base material of air filter
JP2004188409A (en) * 2002-10-15 2004-07-08 Mitsubishi Paper Mills Ltd Filter media and filter media for liquid filtration
JP2004243233A (en) * 2003-02-14 2004-09-02 Toray Ind Inc Biodegradable filtering material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003126628A (en) * 2001-10-26 2003-05-07 Unitica Fibers Ltd Base material of air filter
JP2004188409A (en) * 2002-10-15 2004-07-08 Mitsubishi Paper Mills Ltd Filter media and filter media for liquid filtration
JP2004243233A (en) * 2003-02-14 2004-09-02 Toray Ind Inc Biodegradable filtering material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023037440A1 (en) * 2021-09-08 2023-03-16 北越コーポレーション株式会社 Filter material for air filters
JPWO2023037440A1 (en) * 2021-09-08 2023-03-16
KR20240038046A (en) 2021-09-08 2024-03-22 호쿠에츠 코포레이션 가부시키가이샤 Filter material for air filter
JP7793633B2 (en) 2021-09-08 2026-01-05 北越コーポレーション株式会社 Air filter media
WO2024122160A1 (en) * 2022-12-05 2024-06-13 北越コーポレーション株式会社 Filter material for air filter, and method for manufacturing same
JP2024081052A (en) * 2022-12-05 2024-06-17 北越コーポレーション株式会社 Air filter material and its manufacturing method

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